话简并求值:(a^b-ab)-2(ab^-ba),其中a=-1/2.b=2
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话简并求值:(a^b-ab)-2(ab^-ba),其中a=-1/2.b=2
话简并求值:(a^b-ab)-2(ab^-ba),其中a=-1/2.b=2
话简并求值:(a^b-ab)-2(ab^-ba),其中a=-1/2.b=2
(a²b-ab)-2(ab²-ba)?
=a²b-ab-2ab²+2ab
=a²b-2ab²+ab
=ab(a-2b+1)
=(-1/2)(2)(-1/2-2*2+1)
=-(-1/2-3)
=7/2
7/2